TY  - RPRT
TI  - Cigarette smoking associated with sleep difficulty.
AU  - C R Soldatos
AU  - J D Kales
AU  - M B Scharf
AU  - E O Bixler
AU  - A Kales
PY  - 1980
DO  - 10.1126/science.7352268
UR  - https://pubmed.ncbi.nlm.nih.gov/7352268/
ID  - 7352268
ER  -